Beta was one of the leading Avatars. She worked closely with her fellow Avatars Alpha and Gamma to achieve their ultimate goal, creating Utopia. She also helped persuade Leo Wyatt into joining the Avatars, as well as convince the Charmed Ones to help them. She was killed by Kyle Brody using the Avatar vanquishing potion before she could see the result of her efforts.

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Along with Alpha and Gamma, Beta spent a large amount of time trying to sway Leo Wyatt into seeing that he must join the Avatars so that they can persuade the Charmed Ones into helping establish Utopia. In addition to transforming into a creature head to Leo in an attempt to persuade him to their side like Alpha and Gamma did, Beta offered various explanations and reasons as to why they need Leo and the Charmed Ones to assist in creating Utopia.

After Leo was killed the first time with the Avatar Vanquish Potion by Kyle Brody, Alpha and Beta appeared to Leo, froze time and the two tapped into the Avatars collective power to reverse time so that Leo could prevent the incident from happening.

Beta was also present during Kyle's second attempt to kill Leo, this time along with Alpha, the two froze time again and took the potion bottle with them. She also persuaded Leo into protecting the demon Kyra, a Seer so that she could share a vision of the Utopia with Phoebe, in an attempt to change her mind and join in creating a world where evil didn't exist. With the help of Leo and the sisters, Beta and her fellow Avatars tapped into the collective Avatar power and created Utopia.

Kyle Brody and Zankou fooled Paige into calling Beta to Kyle's apartment, upon arrival Kyle killed her with a special potion designed to vanquish Avatars. This was the second potion he had got, this time back when he went back in time to see how his parents had died. Beta attacked Kyle at the same time, blasting him with electricity, killing him instantly. After Beta's death, the collective power was weakened and the Avatars were only able to reverse time to before Utopia was created, but they were unable to restore Kyle's life. Kyle later became a Whitelighter.

Beta appeared to be one of the more considerate members of the Avatar Collective, always speaking in a placating and reasonable voice. When the Charmed Ones were infected with a paranoia-inducing affliction, Beta spoke reassuringly to them.